The double pack for plant aquariums is recommended for plant growth and to prevent algae growth visual effects vibrant fresh colours dennerle trocal de luxe spezial plant bulb de luxe light quality diameter 26 mm 3000 kelvin state of the art lamp technology new generation alon c longlife technology extra long life over 15 000 operating hours creates a warm particularly pleasant light environment colour index very good special spectrum prevents algae growth with trocal colour peaks